AMMONITES— ZOOLOGICAL, ETC. 



313 



Species of Ammonites peculiar to the lower beds* 



AMMONITES. 



Archiacianus, d'Orb. 

 Auritus, Sower by. 

 Bicurvatus, Michelin. 

 Bouchardianus, d' Orb. 

 Cristatus, Deluc. 

 Denarius, Sow. 

 Fissicostatus, Phillips. 

 Fittoni, d'Archiac. 

 Guersanti, d'Orb. 

 Lautus, Sow. 

 Michelinianus, d'Orb. 



AMMONITES. 



Milletianus, d*Orb. 

 Mosensis, d'Orb. 

 Nodosocostatus, d'Orb. 

 PuzosianuSy d' Orb. 

 Quercifolius, d' Orb. 

 Raulinianus, d'Orb. 

 Regularis, Bruguieres. 

 SplendenSy Sow. 

 Tardefurcatus, Leym. 

 Tubercidatus, Sow. 



Species of Ammonites peculiar to the upper beds. 



AMMONITES. 



Alpinus, d'Orb. 

 Beaudanti, Brongniart. 

 '^Brottianus, d'Orb.{\) 

 Camatteanus, d'Orb. 

 Clementinus, d'Orb. 

 Delarnei, d'Orb. 



AMMONITES. 



'^Latidorsatus, Mich. 

 Lyelli, Leym. 

 Mammillaris, Schlot. 

 '^Mayorianus, d' Orb. 

 Parandieri, d'Orb. 

 Roissyanus, d'Orb. 

 Senequierianus, d'Orb. 

 Varicosus, Sow. 

 Velledce, Mich. 

 Versicostaius, Mich. 



Dupinianus, d'Orb. 

 Hugardianus, d'Orb. 

 '^Inflatus, Sow. 

 Interruptus, Bruguieres. 

 Itieranus, d'Orb. 



The species of the Gault, like those in the Neocomien for- 

 mation, are divided into two Faunas, an upper and lower 

 one, but not so distinctly separated. We sometimes find 

 the same species in the two beds, when they belong to diffe- 

 rent basins, and I am acquainted with some species proper 



(1) The species marked with an asterisk are found highest of all, and 

 the only ones which are found mingled with the Ammonites of the chlo- 

 ritic chalk. 



